[. . . ] It features a 180° angle of view as measured across the diagonal of the frame and provides highquality images from infinity to the closest focusing distance of 0. More accurate exposure control is possible when this is mounted on a Nikon camera having 3D Matrix Metering capability, because subject distance information is transferred from the lens to the camera body. [. . . ] Be careful not to accidentally include unwanted objects in the picture, such as the legs of your tripod or your own hands or feet. Use the optional photo finishing software, Capture NX/Nikon Capture 4, powerful digital postproduction tools, to convert the images taken by this fisheye to the regular wide-angle lens projection system. For more details, see the instruction manual provided with the software. Slight vignetting may occur in the four corners of the frame when shooting at its closest distance or minimum aperture. Taking flash pictures with cameras having built-in flash Avoid taking flash pictures with cameras having a built-in flash, because the flash will not cover this lens's 180° picture angle. Use a gelatin filter by cutting it to an appropriate size as shown in Fig. Distance index line Entfernungs Indexlinie Ligne de repère des distance Línea indicadora de distancias Contrassegno distanza Mounting index Objektivindex Index de montage Indice de monturas Indice di montaggio Clean the lens surfaces with a blower brush. To remove dirt and smudges, use a soft, clean cotton cloth or lens tissue moistened with ethanol (alcohol) or lens cleaner. Wipe in a circular motion from center to outer edge, taking care not to leave traces or touch other parts of the lens. Never use thinner or benzene to clean the lens as this might damage it, result in a fire, or cause health problems. [. . . ] A, when a person standing in front of a distant background is placed within the focus brackets, the background may be in focus, while the subject is out of focus. B, when the subject is highly patterned or of low contrast, such as a field covered with flowers, autofocus may be difficult to obtain. [. . . ]